Results 161 to 170 of about 24,017 (211)

Nitrogen Isotope Effects in Urea Metabolism: From Biochemistry to ¹⁵N Natural Abundance in Cancer. [PDF]

Int J Mol Sci
Tea I, Tcherkez G.
europepmc   +1 more source

Isotope analyses reveal chronological and bioarchaeological consistency at a tribal community of the Sântana de Mureș-Chernyakhov culture in Transylvania. [PDF]

Sci Rep
Major I, Horváth A, Futó I, Gál SS, Szigeti A, Molnár M, Körösfői Z.   +6 more
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High variability in carbon stable isotopes in the macroalga Ulva spp. and implications for eutrophication indicators. [PDF]

Sci Rep
Lloret J.
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The North-Eastern Europe and Northern Asia isotopic dataset of bioarchaeological samples (NEENA). [PDF]

Sci Data
Haponava V, Pickard C, Fernandes R.
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No pervasive relationship between phyllosphere nitrifier abundance and canopy nitrification in European forests. [PDF]

Natl Sci Rev
Zhang Y, Chen J, Zhang F, Duan X, Cheng X, Fang J, Reich PB.   +6 more
europepmc   +1 more source

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USING STABLE ISOTOPES TO MONITOR ANTHROPOGENIC NITROGEN INPUTS TO ESTUARIES

Ecological Applications, 2008
Use of stable nitrogen isotope ratios is one method that has been proposed to indicate anthropogenic nutrient enrichment in estuarine systems. However, the role of stable isotopes as a tool in long-term ecosystem monitoring has not been fully developed.
Charles T Roman
exaly   +4 more sources

Nitrogen stable isotopes in streams: effects of agricultural sources and transformations

Ecological Applications, 2009
The nitrogen stable isotope ratio of biological tissue has been proposed as an indicator of anthropogenic N inputs to aquatic ecosystems, but overlap in the isotopic signatures of various N sources and transformations make definitive attribution of processes difficult. We collected primary consumer invertebrates from streams in agricultural settings in
M Jake Vander Zanden
exaly   +3 more sources

Food webs in forest and pasture streams in the Waikato region, New Zealand: A study based on analyses of stable isotopes of carbon and nitrogen, and fish gut contents [PDF]

New Zealand Journal of Marine and Freshwater Research, 1997
Stable isotopes of carbon (C) and nitrogen (N) were studied in 11 stream communities in the Waikato region of New Zealand. From comparisons of mean d13C and d15N values, food webs in the shaded, forest streams were clearly based on allochthonous material
Brendan J Hicks
exaly   +2 more sources

Mercury and Stable Isotopes of Carbon and Nitrogen in Mink

Environmental Toxicology and Chemistry, 2007
Abstract Total Hg concentrations and values of stable isotopes (δ15N, δ13C) in tissues of mink (Mustela vison) captured in Rhode Island (USA) during winters of 1999 to 2004 were statistically distinct based on location. Mink captured in salt marsh environments (salt marsh group mink [SMGM]) had significantly lower mean Hg concentrations ...
James L, Lake, Stephan A, Ryba, Jonathan, Serbst, Charles F, Brown, Lori, Gibson   +4 more
openaire   +2 more sources

Stable Carbon and Nitrogen Isotopic

Aquatic Geochemistry, 2004
The perennially ice-covered lakes in the McMurdo Dry Valleys, Antarctica, are part of the coldest and driest ecosystem on earth. To understand lacustrine carbon and nitrogen cycling in this end-member ecosystem, and to define paleolimnological proxies for ice-covered lakes, we measured the stable carbon and nitrogen isotopic composition of particulate ...
Jennifer Lawson, Peter T Doran, Fabien Kenig, David J Des marais, John C Priscu   +4 more
openaire   +1 more source